Target Health Blog

FDA Approves New Drug to Treat Flu Symptoms

October 29, 2018

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Regulatory
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Influenza (flu) is a contagious respiratory illness caused by influenza viruses. When patients with the flu are treated within 48 hours of becoming sick, antiviral drugs can reduce symptoms and duration of the illness. Flu season is already well underway, and the CDC recommends getting vaccinated by the end of October, as seasonal flu vaccine is one of the most effective and safest ways to protect against serious flu-related complications, which can result in hospitalizations. Yearly vaccination is the primary means of preventing and controlling flu outbreaks.

The FDA has approved Xofluza (baloxavir marboxil) for the treatment of acute uncomplicated influenza (flu) in patients 12 years of age and older who have been symptomatic for no more than 48 hours. This is the first new antiviral flu treatment with a novel mechanism of action approved by the FDA in nearly 20 year. However, while there are several FDA-approved antiviral drugs to treat flu, they are not a substitute for yearly vaccination.

The safety and efficacy of Xofluza, an antiviral drug taken as a single oral dose, was demonstrated in two randomized controlled clinical trials of 1,832 patients where participants were assigned to receive either Xofluza, a placebo, or another antiviral flu treatment within 48 hours of experiencing flu symptoms. In both trials, patients treated with Xofluza had a shorter time to alleviation of symptoms compared with patients who took the placebo. In the second trial, there was no difference in the time to alleviation of symptoms between subjects who received Xofluza and those who received the other flu treatment. The most common adverse reactions in patients taking Xofluza included diarrhea and bronchitis.

Xofluza was granted Priority Review under which the FDA's goal is to take action on an application within an expedited time frame where the agency determines that the drug, if approved, would significantly improve the safety or effectiveness of treating, diagnosing or preventing a serious condition.

The FDA granted approval of Xofluza to Shionogi & Co., Ltd.

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